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// Copyright 2016 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.devtools.build.lib.skyframe;
import com.google.common.collect.Interner;
import com.google.devtools.build.lib.concurrent.BlazeInterners;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec;
import com.google.devtools.build.lib.vfs.RootedPath;
import com.google.devtools.build.skyframe.AbstractSkyKey;
import com.google.devtools.build.skyframe.SkyFunction;
import com.google.devtools.build.skyframe.SkyFunctionName;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import javax.annotation.Nullable;
/**
* A SkyFunction for resolving //external:* bindings.
*
* <p>This function iterates through the WorkspaceFileValue-s to get the last WorkspaceFileValue
* that will contains all the bind statements from the workspace file.
*/
public class ExternalPackageFunction implements SkyFunction {
@Nullable
@Override
public SkyValue compute(SkyKey skyKey, Environment env) throws InterruptedException {
RootedPath workspacePath = (RootedPath) skyKey.argument();
SkyKey key = WorkspaceFileValue.key(workspacePath);
WorkspaceFileValue value = (WorkspaceFileValue) env.getValue(key);
if (value == null) {
return null;
}
// Walk to the last WorkspaceFileValue that accumulate all the bindings of the WORKSPACE
// file.
while (value.next() != null) {
value = (WorkspaceFileValue) env.getValue(value.next());
if (value == null) {
return null;
}
}
return new PackageValue(value.getPackage());
}
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
/** Returns a {@link Key} to find the WORKSPACE file at the given path. */
public static SkyKey key(RootedPath workspacePath) {
return Key.create(workspacePath);
}
@AutoCodec.VisibleForSerialization
@AutoCodec
static class Key extends AbstractSkyKey<RootedPath> {
private static final Interner<Key> interner = BlazeInterners.newWeakInterner();
private Key(RootedPath arg) {
super(arg);
}
@AutoCodec.VisibleForSerialization
@AutoCodec.Instantiator
static Key create(RootedPath arg) {
return interner.intern(new Key(arg));
}
@Override
public SkyFunctionName functionName() {
return SkyFunctions.EXTERNAL_PACKAGE;
}
}
}
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